if i buy for example a "pure" force from the market forum will i be able to put it on my tori? i dont have 10000 and i was wondering since it requires 10000 qi in the shop do u need that qi to buy it or to wear it?

You need 10000 qi to buy it and wear it.

k so say me and u were trading via safetrade would i even be able to own it or would safetrade not allow it

Just to make things more clear, you will never be able to have any qi items in your inventory if you don't have the qi needed.